Answer:
not an answer but how do you attach images because it would be more useful
Step-by-step explanation:
We know that
A relationship between two variables, x, and y,<span> is proportional if it can be expressed in the form y/x=k or y=kx</span>
in this problem
k=2
then
y=2x
therefore
the answer is the option
y=2x
1/2 (12)(5a+7b)
6(5a+7b)
30a + 42b -- I hope this helped